Why is option b incorrect

Dear student,

$W e i g h t o f s o l u t e = 110 g W e i g h t o f s o l u t i o n = 550 g C o n c e n t r a t i o n o f s o l u t i o n = \frac{W e i g h t o f s o l u t e}{W e i g h t o f s o l u t i o n} \times 100 \Rightarrow \frac{110}{550} \times 100 = 20 % H e n c e, t h e c o r r e c t o p t i o n i s (A) .$
Regards

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